import {z} from 'zod'

export type GetApiApiV2GovernanceOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewayDataCaptureMode = z.enum(["metadata_only", "full_capture"]);

export const aiGatewayMetadataCaptureItem = z.enum(["tool_usage", "tool_output_size", "tool_names", "conversation_shape", "input_size_by_role", "available_tools", "generation_settings"]);

export const aiGatewayMetadataCapture = z.array(aiGatewayMetadataCaptureItem);

export const aiGatewayZDRMode = z.enum(["off", "required"]);

export const aiGatewayGovernanceAttributes = z.object({data_capture_mode: aiGatewayDataCaptureMode, metadata_capture: aiGatewayMetadataCapture.optional(), zdr_mode: aiGatewayZDRMode});

export const aiGatewayGovernanceType = z.literal("governance");

export const aiGatewayGovernanceResource = z.object({attributes: aiGatewayGovernanceAttributes, id: z.string(), type: aiGatewayGovernanceType});

export const aiGatewayGovernanceResponse = z.object({data: aiGatewayGovernanceResource});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Get AI Gateway governance controls
 * 
 * GET /api/v2/governance
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2Governance = async (options?: GetApiApiV2GovernanceOptions) => {
const {baseUrl = "https://api.datadoghq.com", fetch: fetchFn = fetch, apiKeyAuth, appKeyAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (apiKeyAuth !== undefined) headers.set("DD-API-KEY", apiKeyAuth)
if (appKeyAuth !== undefined) headers.set("DD-APPLICATION-KEY", appKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/governance${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(aiGatewayGovernanceResponse, await res.json())
};